Solvent extraction of lanthanum(III), europium(III) and lutetium(III) by bis(4-acyl-5-hydroxypyrazoles) derivatives

Highly Efficient Extraction Separation of Lanthanides Using a Diglycolamic Acid Extractant

“…The extraction efficiency of Ln cations using neutral Lewis-base-type extractants increases with increasing anion concentration, whereas Ln transfer using ionizable Brønsted-acid-type extractants can be simply controlled by the pH of the aqueous phase, and involves no anionic species. Although CHON-based extractants incorporating Brønsted acids such as carboxylic acids [19][20][21][22][23] or β-diketones 24,25 have also been developed for the extraction of Ln cations, almost all of these extractants have very low extraction and separation performances for Ln cations because of their poor coordinating ability and selectivity for Ln cations. The development of Brønsted-acid-type extractants based on the CHON-principle, with superior extraction separation abilities relative to organophosphorus compounds, represents a challenging task.…”

Synergistic extraction of lanthanoids with heterocyclic β-ketoenols and 2,4,6-tri(2-pyridyl)-1,3,5-triazine, TPTZPart II. Extraction of La(III), Eu(III) and Lu(III) with a bis(4-acyl-5-hydroxypyrazole) and TPTZ

“…This is also the case for the extractions of La 3+ , Eu 3+ and Lu 3+ with HL-10-LH alone [25]. Thus, to determine the selectivity factors, one may compare the extraction curves reported in Fig.…”

“…Thus, the efficiency order of the synergistic extractions is La < Lu < Eu for HL-10-LH: the synergist modulates the selectivity. Indeed, the complexation constants of TPTZ in aqueous phase follow the order La ≤ Lu < Eu [26]; thus, TPTZ changes the extrac- Table 1 Selectivity values corresponding to the extraction of La(III), Eu(III) and Lu(III) from 0.1 M nitrate medium with HL-10-LH [25] and to the synergistic extraction of La(III), Eu(III) and Lu(III) with HL-10-LH and TPTZ, in chloroform at 25 tion selectivity through its lanthanoid complexation properties. A comparable phenomenon is observed for HPMtbBP, but to a lesser extent: the order of synergistic extraction is La < Eu = Lu.…”

“…Extraction of Ln 3+ by HL-10-LH alone[25] or in the presence of TPTZ in chloroform at 25 • C. [(Na,H)NO 3 ] = 0.1 M; [HL-10-LH] i,org = 0.005 M. [TPTZ] i,org = 0 M for the clear points. [TPTZ] i,org = 0.005 M for the black points.…”

Separation of red (Y2O3:Eu3+), blue (BaMgAl10O17:Eu2+) and green (CeMgAl10O17:Tb3) rare earth phosphors by liquid/liquid extraction

“…Fig.4 shows the extraction results in chloroform/PST solution system and a typical extraction phenomenon is shown in Fig.5. The blue and green phos- phors could be extracted into organic layer (lower layer), because chloroform is a heavy solvent, which is widely used for extracting metal complex from aqueous solution [12] . The extraction recovery is over 90% during the pH range from 7 to 11, and the red phosphor could be dispersed in the aqueous solution and the distribution on organic phase is less than 10%.…”